I ordered wood filler in a variety of colors and will do some experimenting to see if I can get a good match. I also ordered a dental pick and Goo-gone to try to carefully remove the glue. In the meantime I tried using what I have on hand to fix things. I don't think it looks half bad. I attached before and after photos. I tried to make it look like it's just a part of the wood that took a lot of grain filler. I did my best to give it an irregular shape and different shades of black. What do you think?